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993 lines
26 KiB
993 lines
26 KiB
/*++
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Copyright (c) 1990 Microsoft Corporation
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Module Name:
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comport.c
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Abstract:
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This module contains C code to determine comport and LPT configuration in
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syste.
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Author:
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Shie-Lin Tzong (shielint) Dec-23-1991
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Revision History:
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--*/
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#include "hwdetect.h"
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#include "comlpt.h"
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#include "bios.h"
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#include "string.h"
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#define LOWEST_IRQ 3
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#define MASTER_IRQ_MASK_BITS 0xf8
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#define SLAVE_IRQ_MASK_BITS 0xfe
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//
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// ComPortAddress[] is a global array to remember which comports have
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// been detected and their I/O port addresses.
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//
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USHORT ComPortAddress[MAX_COM_PORTS] = {0, 0, 0, 0};
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VOID
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SerialInterruptRequest (
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PUCHAR PortAddress
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)
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/*++
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Routine Description:
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This routine generates an interrupt on the interrupt line for
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com port.
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Arguments:
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PortAddress - the port address of the desired com port.
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Return Value:
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None.
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--*/
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{
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USHORT i;
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UCHAR Temp;
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WRITE_PORT_UCHAR(
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PortAddress + MODEM_CONTROL_REGISTER,
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8
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);
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WRITE_PORT_UCHAR(
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PortAddress + INTERRUPT_ENABLE_REGISTER,
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0
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);
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WRITE_PORT_UCHAR(
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PortAddress + INTERRUPT_ENABLE_REGISTER,
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0xf
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);
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//
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// Add some delay
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//
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for (i = 0; i < 5 ; i++ ) {
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Temp = READ_PORT_UCHAR((PUCHAR) PIC1_PORT1);
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Temp = READ_PORT_UCHAR((PUCHAR) PIC2_PORT1);
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}
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}
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VOID
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SerialInterruptDismiss (
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PUCHAR PortAddress
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)
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/*++
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Routine Description:
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This routine dismisses an interrupt on the interrupt line for
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com port.
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Arguments:
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PortAddress - the port address of the desired com port.
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Return Value:
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None.
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--*/
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{
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USHORT i;
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UCHAR Temp;
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Temp = READ_PORT_UCHAR(
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PortAddress + INTERRUPT_IDENT_REGISTER
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);
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WRITE_PORT_UCHAR(
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PortAddress + INTERRUPT_ENABLE_REGISTER,
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0
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);
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//
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// Add some delay
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//
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for (i = 0; i < 5 ; i++ ) {
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Temp = READ_PORT_UCHAR((PUCHAR) PIC1_PORT1);
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Temp = READ_PORT_UCHAR((PUCHAR) PIC2_PORT1);
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}
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}
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BOOLEAN
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DoesPortExist(
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IN PUCHAR Address
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)
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/*++
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Routine Description:
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This routine examines several of what might be the serial device
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registers. It ensures that the bits that should be zero are zero.
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It will then attempt to set the device to 19200 baud. If the
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will then attempt to read that baud. If it is still 19200 then
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we can feel pretty safe that this is a serial device.
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NOTE: If there is indeed a serial port at the address specified
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it will absolutely have interrupts inhibited upon return
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from this routine.
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Arguments:
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Address - address of hw port.
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Return Value:
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TRUE - Port exists. Party on.
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FALSE - Port doesn't exist. Don't use it.
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History:
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7/23/97 a-paulbr fixed bug 95050. Init LineControl to 0x00
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--*/
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{
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UCHAR IerContents;
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UCHAR BaudRateMsb, BaudRateLsb;
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BOOLEAN ReturnValue = FALSE;
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UCHAR LineControl = 0x00;
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UCHAR LineControl_Save;
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UCHAR Temp;
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//
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// Save the original LCR, so we can restore it later
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// We won't use it, because the port could be handing us
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// a bad initial value. We will use 0x00 instead.
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//
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LineControl_Save = READ_PORT_UCHAR(Address+LINE_CONTROL_REGISTER);
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//
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// Read original baud rate divisor and save it.
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//
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WRITE_PORT_UCHAR(
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Address+LINE_CONTROL_REGISTER,
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(UCHAR)(LineControl | SERIAL_LCR_DLAB)
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);
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BaudRateMsb = READ_PORT_UCHAR(Address+DIVISOR_LATCH_MSB);
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BaudRateLsb = READ_PORT_UCHAR(Address+DIVISOR_LATCH_LSB);
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//
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// Change baud rate to 9600.
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//
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WRITE_PORT_UCHAR(Address+DIVISOR_LATCH_MSB, BAUD_RATE_9600_MSB);
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WRITE_PORT_UCHAR(Address+DIVISOR_LATCH_LSB, BAUD_RATE_9600_LSB);
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//
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// Read IER and save it away.
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//
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WRITE_PORT_UCHAR(
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Address+LINE_CONTROL_REGISTER,
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(UCHAR)(LineControl & ~SERIAL_LCR_DLAB)
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);
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IerContents = READ_PORT_UCHAR(
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Address + INTERRUPT_ENABLE_REGISTER
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);
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WRITE_PORT_UCHAR(
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Address + INTERRUPT_ENABLE_REGISTER,
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IER_TEST_VALUE
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);
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//
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// Read baud rate divisor. The values we read should be equal to the
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// values we set earlier.
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//
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WRITE_PORT_UCHAR(
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Address+LINE_CONTROL_REGISTER,
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(UCHAR)(LineControl | SERIAL_LCR_DLAB)
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);
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Temp = READ_PORT_UCHAR(Address+DIVISOR_LATCH_MSB);
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if (Temp != BAUD_RATE_9600_MSB) {
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goto AllDone;
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}
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Temp = READ_PORT_UCHAR(Address+DIVISOR_LATCH_LSB);
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if (Temp != BAUD_RATE_9600_LSB) {
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goto AllDone;
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}
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//
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// Read IER and it should be equal to the value we set earlier.
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//
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WRITE_PORT_UCHAR(
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Address+LINE_CONTROL_REGISTER,
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(UCHAR)(LineControl & ~SERIAL_LCR_DLAB)
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);
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Temp = READ_PORT_UCHAR(
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Address + INTERRUPT_ENABLE_REGISTER
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);
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if (Temp != IER_TEST_VALUE) {
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goto AllDone;
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}
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ReturnValue = TRUE;
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AllDone:
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//
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// Restore registers which we destroyed .
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//
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WRITE_PORT_UCHAR(
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Address+LINE_CONTROL_REGISTER,
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(UCHAR)(LineControl & ~SERIAL_LCR_DLAB)
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);
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WRITE_PORT_UCHAR(
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Address + INTERRUPT_ENABLE_REGISTER,
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IerContents
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);
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WRITE_PORT_UCHAR(
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Address+LINE_CONTROL_REGISTER,
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(UCHAR)(LineControl | SERIAL_LCR_DLAB)
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);
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WRITE_PORT_UCHAR(Address+DIVISOR_LATCH_MSB, BaudRateMsb);
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WRITE_PORT_UCHAR(Address+DIVISOR_LATCH_LSB, BaudRateLsb);
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WRITE_PORT_UCHAR(
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Address+LINE_CONTROL_REGISTER,
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LineControl_Save
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);
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return ReturnValue;
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}
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BOOLEAN
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HwInterruptDetection(
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IN PUCHAR BasePort,
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IN VOID (*InterruptRequestRoutine)(PUCHAR),
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IN VOID (*InterruptDismissRoutine)(PUCHAR),
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OUT PUSHORT Vector
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)
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/*++
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Routine Description:
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This routine attempts to locate the interrupt vector for which
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the device is configured. The allowable vectors are
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3 - 7, and 9 - 15. If no interrupt vector is found, or more than
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one is found, the routine returns FALSE. Otherwise, TRUE is returned.
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Note that we diddle the i8259 interrupt controllers here.
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Arguments:
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BasePort - the I/O port base for the device.
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InterruptRequestRoutine - A pointer to a routine to generate
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desired interrupt.
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InterruptDismissRoutine - A pointer to a routine to dismiss the interrupt
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generated by InterruptRequestRoutine.
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Vector - Pointer to the location to store the mouse interrupt vector.
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Return Value:
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Returns TRUE if the Inport interrupt vector was located; otherwise,
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FALSE is returned.
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--*/
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{
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UCHAR OldMasterMask, OldSlaveMask;
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UCHAR MasterMask, SlaveMask;
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UCHAR InterruptBits;
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UCHAR PossibleInterruptBits;
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int i;
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int NumberOfIRQs;
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BOOLEAN VectorFound = FALSE;
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//
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// Get the i8259 interrupt masks.
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//
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OldMasterMask = READ_PORT_UCHAR((PUCHAR) PIC1_PORT1);
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OldSlaveMask = READ_PORT_UCHAR((PUCHAR) PIC2_PORT1);
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//
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// Raise IRQL to the highest priority IRQL the inport would use.
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//
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WRITE_PORT_UCHAR(
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(PUCHAR) PIC1_PORT1,
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(UCHAR) 0xff ^ ((UCHAR)(1 << LOWEST_IRQ) - 1)
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);
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WRITE_PORT_UCHAR(
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(PUCHAR) PIC2_PORT1,
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(UCHAR) 0xfe
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);
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//
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// Get the master i8259 interrupt mask.
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//
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MasterMask = READ_PORT_UCHAR((PUCHAR) PIC1_PORT1);
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//
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// Disable potential device interrupts.
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//
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WRITE_PORT_UCHAR(
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(PUCHAR) PIC1_PORT1,
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(UCHAR) (MasterMask | MASTER_IRQ_MASK_BITS)
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);
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//
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// Attempt to locate the interrupt line on the master i8259.
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// Why try this 10 times? It's magic...
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//
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PossibleInterruptBits = MASTER_IRQ_MASK_BITS;
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for (i = 0; i < 10; i++) {
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//
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// Generate a 0 on the master 8259 interrupt line
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//
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(*InterruptDismissRoutine)(BasePort);
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//
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// Read the interrupt bits off the master i8259. Only bits
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// 3 - 7 are of interest. Eliminate non-functional
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// IRQs. Only continue looking at the master i8259 if there
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// is at least one functional IRQ.
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//
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_asm {cli}
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WRITE_PORT_UCHAR((PUCHAR) PIC1_PORT0, OCW3_READ_IRR);
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InterruptBits = READ_PORT_UCHAR((PUCHAR) PIC1_PORT0);
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_asm {sti}
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InterruptBits &= MASTER_IRQ_MASK_BITS;
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InterruptBits ^= MASTER_IRQ_MASK_BITS;
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PossibleInterruptBits &= InterruptBits;
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if (!PossibleInterruptBits) {
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break;
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}
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//
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// Generate an interrupt from the desired device.
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//
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(*InterruptRequestRoutine)(BasePort);
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//
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// Read the interrupt bits off the master i8259. Only bits
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// 3 - 7 are of interest. Eliminate non-functional
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// IRQs. Only continue looking at the master i8259 if there
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// is at least one functional IRQ.
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//
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_asm {cli}
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WRITE_PORT_UCHAR((PUCHAR) PIC1_PORT0, OCW3_READ_IRR);
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InterruptBits = READ_PORT_UCHAR((PUCHAR) PIC1_PORT0);
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_asm {sti}
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InterruptBits &= MASTER_IRQ_MASK_BITS;
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PossibleInterruptBits &= InterruptBits;
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if (!PossibleInterruptBits) {
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break;
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}
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}
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if (PossibleInterruptBits) {
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//
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// We found at least one IRQ on the master i8259 that could belong
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// to the Inport mouse. Count how many we found. If there is
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// more than one, we haven't found the vector. Otherwise, we've
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// successfully located the Inport interrupt vector on the master
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// i8259 (provided the interrupt vector is 3, 4, 5, or 7).
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//
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PossibleInterruptBits >>= 3;
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NumberOfIRQs = 0;
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for (i = 3; i <= 7; i++) {
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if (PossibleInterruptBits & 1) {
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NumberOfIRQs += 1;
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*Vector = (CCHAR) i;
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}
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PossibleInterruptBits >>= 1;
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}
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if (NumberOfIRQs == 1) {
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VectorFound = TRUE;
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}
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}
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//
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// If we didn't locate the interrupt vector on the master i8259, attempt
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// to locate it on the slave i8259.
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//
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if (!VectorFound) {
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//
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// Get the slave i8259 interrupt mask.
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//
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SlaveMask = READ_PORT_UCHAR((PUCHAR) PIC2_PORT1);
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//
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// Attempt to locate the interupt line on the slave i8259.
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// Why try this 20 times? It's magic...
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//
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PossibleInterruptBits = SLAVE_IRQ_MASK_BITS;
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for (i = 0; i < 20; i++) {
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//
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// Generate a 0 on the Inport IRQ on the slave i8259.
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//
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(*InterruptDismissRoutine)(BasePort);
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//
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// Read the interrupt bits off the slave i8259.
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// Eliminate non-functional IRQs. Only continue
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// looking at the slave i8259 if there is at least one
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// functional IRQ.
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//
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_asm {cli}
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WRITE_PORT_UCHAR((PUCHAR) PIC2_PORT0, OCW3_READ_IRR);
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InterruptBits = READ_PORT_UCHAR((PUCHAR) PIC2_PORT0);
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_asm {sti}
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InterruptBits &= SLAVE_IRQ_MASK_BITS;
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InterruptBits ^= SLAVE_IRQ_MASK_BITS;
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PossibleInterruptBits &= InterruptBits;
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if (!PossibleInterruptBits) {
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break;
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}
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//
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// Generate a 1 on the Inport IRQ on the slave i8259.
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//
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(*InterruptRequestRoutine)(BasePort);
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//
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// Read the interrupt bits off the slave i8259.
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// Eliminate non-functional IRQs. Only continue
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// looking at the slave i8259 if there is at least one
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// functional IRQ.
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//
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_asm {cli}
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WRITE_PORT_UCHAR((PUCHAR) PIC2_PORT0, OCW3_READ_IRR);
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InterruptBits = READ_PORT_UCHAR((PUCHAR) PIC2_PORT0);
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_asm {sti}
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InterruptBits &= SLAVE_IRQ_MASK_BITS;
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PossibleInterruptBits &= InterruptBits;
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if (!PossibleInterruptBits) {
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break;
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}
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}
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if (PossibleInterruptBits) {
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//
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// We found at least one IRQ on the slave i8259 that could belong
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// to the device. Count how many we found. If there is
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// more than one, we haven't found the vector. Otherwise, we've
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// successfully located the device interrupt vector on the slave
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// i8259.
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//
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PossibleInterruptBits >>= 1;
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NumberOfIRQs = 0;
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for (i = 9; i <= 15; i++) {
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if (PossibleInterruptBits & 1) {
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NumberOfIRQs += 1;
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*Vector = (CCHAR) i;
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}
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PossibleInterruptBits >>= 1;
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}
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if (NumberOfIRQs == 1) {
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VectorFound = TRUE;
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}
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}
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//
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// Restore the i8259 slave.
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//
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WRITE_PORT_UCHAR((PUCHAR) PIC2_PORT0, OCW3_READ_ISR);
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//
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// Restore the i8259 slave interrupt mask.
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//
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WRITE_PORT_UCHAR((PUCHAR) PIC2_PORT1, SlaveMask);
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}
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//
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// Dismiss interrupt on the device
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//
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(*InterruptDismissRoutine)(BasePort);
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//
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// Restore the i8259 master.
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//
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WRITE_PORT_UCHAR((PUCHAR) PIC1_PORT0, OCW3_READ_ISR);
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//
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// Restore the i8259 master interrupt mask.
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//
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WRITE_PORT_UCHAR((PUCHAR) PIC1_PORT1, MasterMask);
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//
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// Restore the previous IRQL.
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//
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WRITE_PORT_UCHAR(
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(PUCHAR) PIC1_PORT1,
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OldMasterMask
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);
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WRITE_PORT_UCHAR(
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(PUCHAR) PIC2_PORT1,
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OldSlaveMask
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);
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return(VectorFound);
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}
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|
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FPFWCONFIGURATION_COMPONENT_DATA
|
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GetComportInformation (
|
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VOID
|
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)
|
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|
|
/*++
|
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|
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Routine Description:
|
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|
|
This routine will attempt to detect the comports information
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for the system. The information includes port address, irq
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level.
|
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|
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Note that this routine can only detect up to 4 comports and
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it assumes that if MCA, COM3 and COM4 use irq 4. Otherwise,
|
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COM3 uses irq 4 and COM4 uses irq 3. Also, the number of ports
|
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for COMPORT is set to 8 (for example, COM2 uses ports 2F8 - 2FF)
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|
|
Arguments:
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None.
|
|
|
|
Return Value:
|
|
|
|
A pointer to a stucture of type FWCONFIGURATION_COMPONENT_DATA
|
|
which is the root of comport component list.
|
|
If no comport exists, a value of NULL is returned.
|
|
|
|
--*/
|
|
|
|
{
|
|
|
|
FPFWCONFIGURATION_COMPONENT_DATA CurrentEntry, PreviousEntry = NULL;
|
|
FPFWCONFIGURATION_COMPONENT_DATA FirstComport = NULL;
|
|
FPFWCONFIGURATION_COMPONENT Component;
|
|
HWCONTROLLER_DATA ControlData;
|
|
UCHAR i, j, z;
|
|
SHORT Port;
|
|
UCHAR ComportName[] = "COM?";
|
|
CM_SERIAL_DEVICE_DATA SerialData;
|
|
ULONG BaudClock = 1843200;
|
|
USHORT Vector;
|
|
BOOLEAN PortExist;
|
|
USHORT IoPorts[MAX_COM_PORTS] = {0x3f8, 0x2f8, 0x3e8, 0x2e8};
|
|
|
|
|
|
//
|
|
// BIOS DATA area 40:0 is the port address of the first valid COM port
|
|
//
|
|
|
|
USHORT far *pPortAddress = (USHORT far *)0x00400000;
|
|
|
|
//
|
|
// Initialize serial device specific data
|
|
//
|
|
|
|
SerialData.Version = 0;
|
|
SerialData.Revision = 0;
|
|
SerialData.BaudClock = 1843200;
|
|
|
|
//
|
|
// Initialize default COM port address.
|
|
// Some BIOS puts incorrect comport address to the 40:0 area.
|
|
// To cope with this problem, we test the port address supplied
|
|
// by BIOS first. If it fail, we try our default port.
|
|
//
|
|
|
|
for (i = 0; i < MAX_COM_PORTS; i++) {
|
|
for (j = 0; j < MAX_COM_PORTS; j++) {
|
|
if (IoPorts[i] == *(pPortAddress + j)) {
|
|
IoPorts[i] = 0;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
for (i = 0; i < MAX_COM_PORTS; i++) {
|
|
|
|
PortExist = FALSE;
|
|
|
|
//
|
|
// Initialize Controller data
|
|
//
|
|
|
|
ControlData.NumberPortEntries = 0;
|
|
ControlData.NumberIrqEntries = 0;
|
|
ControlData.NumberMemoryEntries = 0;
|
|
ControlData.NumberDmaEntries = 0;
|
|
z = 0;
|
|
|
|
//
|
|
// Load the port address from the BIOS data area, if it exists
|
|
//
|
|
|
|
Port = *(pPortAddress + i);
|
|
|
|
//
|
|
// Determine if the port exists
|
|
//
|
|
|
|
if (Port != 0) {
|
|
if (DoesPortExist((PUCHAR)Port)) {
|
|
PortExist = TRUE;
|
|
}
|
|
}
|
|
if (!PortExist && (Port = IoPorts[i])) {
|
|
if (PortExist = DoesPortExist((PUCHAR)Port)) {
|
|
IoPorts[i] = 0;
|
|
*(pPortAddress+i) = (USHORT)Port;
|
|
}
|
|
}
|
|
if (PortExist) {
|
|
|
|
//
|
|
// Remember the port address in our global variable
|
|
// such that other detection code (e.g. Serial Mouse) can
|
|
// get the information.
|
|
//
|
|
|
|
ComPortAddress[i] = Port;
|
|
|
|
CurrentEntry = (FPFWCONFIGURATION_COMPONENT_DATA)HwAllocateHeap (
|
|
sizeof(FWCONFIGURATION_COMPONENT_DATA), TRUE);
|
|
if (!FirstComport) {
|
|
FirstComport = CurrentEntry;
|
|
}
|
|
Component = &CurrentEntry->ComponentEntry;
|
|
|
|
Component->Class = ControllerClass;
|
|
Component->Type = SerialController;
|
|
Component->Flags.ConsoleOut = 1;
|
|
Component->Flags.ConsoleIn = 1;
|
|
Component->Flags.Output = 1;
|
|
Component->Flags.Input = 1;
|
|
Component->Version = 0;
|
|
Component->Key = i;
|
|
Component->AffinityMask = 0xffffffff;
|
|
|
|
//
|
|
// Set up type string.
|
|
//
|
|
|
|
ComportName[3] = i + (UCHAR)'1';
|
|
|
|
//
|
|
// Set up Port information
|
|
//
|
|
|
|
ControlData.NumberPortEntries = 1;
|
|
ControlData.DescriptorList[z].Type = RESOURCE_PORT;
|
|
ControlData.DescriptorList[z].ShareDisposition =
|
|
CmResourceShareDeviceExclusive;
|
|
ControlData.DescriptorList[z].Flags = CM_RESOURCE_PORT_IO;
|
|
ControlData.DescriptorList[z].u.Port.Start.LowPart = (ULONG)Port;
|
|
ControlData.DescriptorList[z].u.Port.Start.HighPart = 0;
|
|
ControlData.DescriptorList[z].u.Port.Length = 7;
|
|
z++;
|
|
|
|
//
|
|
// Set up Irq information
|
|
//
|
|
|
|
ControlData.NumberIrqEntries = 1;
|
|
ControlData.DescriptorList[z].Type = RESOURCE_INTERRUPT;
|
|
ControlData.DescriptorList[z].ShareDisposition =
|
|
CmResourceShareUndetermined;
|
|
if (HwBusType == MACHINE_TYPE_MCA) {
|
|
ControlData.DescriptorList[z].Flags = LEVEL_SENSITIVE;
|
|
if (i == 0) { // COM1 - irql4; COM2 - COM3 - irq3
|
|
ControlData.DescriptorList[z].u.Interrupt.Level = 4;
|
|
ControlData.DescriptorList[z].u.Interrupt.Vector = 4;
|
|
} else {
|
|
ControlData.DescriptorList[z].u.Interrupt.Level = 3;
|
|
ControlData.DescriptorList[z].u.Interrupt.Vector = 3;
|
|
}
|
|
} else {
|
|
|
|
//
|
|
// For EISA the LevelTriggered is temporarily set to FALSE.
|
|
// COM1 and COM3 use irq 4; COM2 and COM4 use irq3
|
|
//
|
|
|
|
ControlData.DescriptorList[z].Flags = EDGE_TRIGGERED;
|
|
if (Port == 0x3f8 || Port == 0x3e8) {
|
|
ControlData.DescriptorList[z].u.Interrupt.Level = 4;
|
|
ControlData.DescriptorList[z].u.Interrupt.Vector = 4;
|
|
} else if (Port == 0x2f8 || Port == 0x2e8) {
|
|
ControlData.DescriptorList[z].u.Interrupt.Level = 3;
|
|
ControlData.DescriptorList[z].u.Interrupt.Vector = 3;
|
|
} else if (i == 0 || i == 2) {
|
|
ControlData.DescriptorList[z].u.Interrupt.Level = 4;
|
|
ControlData.DescriptorList[z].u.Interrupt.Vector = 4;
|
|
} else {
|
|
ControlData.DescriptorList[z].u.Interrupt.Level = 3;
|
|
ControlData.DescriptorList[z].u.Interrupt.Vector = 3;
|
|
}
|
|
}
|
|
|
|
ControlData.DescriptorList[z].u.Interrupt.Affinity = ALL_PROCESSORS;
|
|
|
|
//
|
|
// Try to determine the interrupt vector. If we success, the
|
|
// new vector will be used to replace the default value.
|
|
//
|
|
|
|
if (HwInterruptDetection((PUCHAR)Port,
|
|
SerialInterruptRequest,
|
|
SerialInterruptDismiss,
|
|
&Vector)) {
|
|
|
|
ControlData.DescriptorList[z].u.Interrupt.Level =
|
|
(ULONG)Vector;
|
|
ControlData.DescriptorList[z].u.Interrupt.Vector =
|
|
(ULONG)Vector;
|
|
}
|
|
|
|
//
|
|
// Since the com port interrupt detection destryed some
|
|
// of the com port registers, here we do the clean up.
|
|
//
|
|
|
|
WRITE_PORT_UCHAR ((PUCHAR)(Port + INTERRUPT_ENABLE_REGISTER), 0);
|
|
WRITE_PORT_UCHAR ((PUCHAR)(Port + MODEM_CONTROL_REGISTER), 0);
|
|
|
|
CurrentEntry->ConfigurationData =
|
|
HwSetUpResourceDescriptor(Component,
|
|
ComportName,
|
|
&ControlData,
|
|
sizeof(SerialData),
|
|
(PUCHAR)&SerialData
|
|
);
|
|
if (PreviousEntry) {
|
|
PreviousEntry->Sibling = CurrentEntry;
|
|
}
|
|
PreviousEntry = CurrentEntry;
|
|
}
|
|
}
|
|
return(FirstComport);
|
|
}
|
|
|
|
FPFWCONFIGURATION_COMPONENT_DATA
|
|
GetLptInformation (
|
|
VOID
|
|
)
|
|
|
|
/*++
|
|
|
|
Routine Description:
|
|
|
|
This routine will attempt to detect the parallel printer port
|
|
information for the system. The information includes port address,
|
|
irq level.
|
|
|
|
Note if this code is run after user established NETWORK LPT
|
|
connection. The Network LPT will be counted as regular parallel
|
|
port.
|
|
|
|
Arguments:
|
|
|
|
None.
|
|
|
|
Return Value:
|
|
|
|
A pointer to a stucture of type PONENT_DATA
|
|
which is the root of Parallel component list.
|
|
If no comport exists, a value of NULL is returned.
|
|
|
|
--*/
|
|
|
|
{
|
|
|
|
FPFWCONFIGURATION_COMPONENT_DATA CurrentEntry, PreviousEntry = NULL;
|
|
FPFWCONFIGURATION_COMPONENT_DATA FirstLptPort = NULL;
|
|
FPFWCONFIGURATION_COMPONENT Component;
|
|
HWCONTROLLER_DATA ControlData;
|
|
UCHAR LptPortName[] = "PARALLEL?";
|
|
USHORT i, z;
|
|
USHORT LptStatus;
|
|
ULONG Port;
|
|
|
|
//
|
|
// BIOS DATA area 40:8 is the port address of the first valid COM port
|
|
//
|
|
|
|
USHORT far *pPortAddress = (USHORT far *)0x00400008;
|
|
|
|
for (i = 0; i < MAX_LPT_PORTS; i++) {
|
|
|
|
Port = (ULONG)*(pPortAddress + i);
|
|
if (Port == 0) {
|
|
continue;
|
|
} else {
|
|
|
|
//
|
|
// If we think we have a lpt, we will initialize it to
|
|
// a known state. In order to make printing work under
|
|
// nt, the arbitration level must be disabled. The BIOS
|
|
// init function seems to do the trick.
|
|
//
|
|
|
|
_asm {
|
|
mov ah, 1
|
|
mov dx, i
|
|
int 17h
|
|
}
|
|
}
|
|
|
|
//
|
|
// Initialize Controller data
|
|
//
|
|
|
|
ControlData.NumberPortEntries = 0;
|
|
ControlData.NumberIrqEntries = 0;
|
|
ControlData.NumberMemoryEntries = 0;
|
|
ControlData.NumberDmaEntries = 0;
|
|
z = 0;
|
|
|
|
//
|
|
// Determine if the port exists
|
|
//
|
|
|
|
LptStatus = _bios_printer(_PRINTER_STATUS, i , 0);
|
|
if (!(LptStatus & 6)){
|
|
CurrentEntry = (FPFWCONFIGURATION_COMPONENT_DATA)HwAllocateHeap (
|
|
sizeof(FWCONFIGURATION_COMPONENT_DATA), TRUE);
|
|
if (!FirstLptPort) {
|
|
FirstLptPort = CurrentEntry;
|
|
}
|
|
Component = &CurrentEntry->ComponentEntry;
|
|
|
|
Component->Class = ControllerClass;
|
|
Component->Type = ParallelController;
|
|
Component->Flags.Output = 1;
|
|
Component->Version = 0;
|
|
Component->Key = i;
|
|
Component->AffinityMask = 0xffffffff;
|
|
|
|
//
|
|
// Set up type string.
|
|
//
|
|
|
|
LptPortName[8] = (UCHAR)i + (UCHAR)'1';
|
|
|
|
//
|
|
// Set up Port information
|
|
//
|
|
|
|
Port = (ULONG)*(pPortAddress + i);
|
|
ControlData.NumberPortEntries = 1;
|
|
ControlData.DescriptorList[z].Type = RESOURCE_PORT;
|
|
ControlData.DescriptorList[z].ShareDisposition =
|
|
CmResourceShareDeviceExclusive;
|
|
ControlData.DescriptorList[z].Flags = CM_RESOURCE_PORT_IO;
|
|
ControlData.DescriptorList[z].u.Port.Start.LowPart = Port;
|
|
ControlData.DescriptorList[z].u.Port.Start.HighPart = 0;
|
|
ControlData.DescriptorList[z].u.Port.Length = 3;
|
|
z++;
|
|
|
|
//
|
|
// Set up Irq information
|
|
//
|
|
|
|
ControlData.NumberIrqEntries = 1;
|
|
ControlData.DescriptorList[z].Type = RESOURCE_INTERRUPT;
|
|
ControlData.DescriptorList[z].ShareDisposition =
|
|
CmResourceShareUndetermined;
|
|
ControlData.DescriptorList[z].u.Interrupt.Affinity = ALL_PROCESSORS;
|
|
if (i ==0) {
|
|
ControlData.DescriptorList[z].u.Interrupt.Level = 7;
|
|
ControlData.DescriptorList[z].u.Interrupt.Vector = 7;
|
|
} else {
|
|
ControlData.DescriptorList[z].u.Interrupt.Level = 5;
|
|
ControlData.DescriptorList[z].u.Interrupt.Vector = 5;
|
|
}
|
|
|
|
if (HwBusType == MACHINE_TYPE_MCA) {
|
|
ControlData.DescriptorList[z].Flags = LEVEL_SENSITIVE;
|
|
} else {
|
|
|
|
//
|
|
// For EISA the LevelTriggered is temporarily set to FALSE.
|
|
//
|
|
|
|
ControlData.DescriptorList[z].Flags = EDGE_TRIGGERED;
|
|
}
|
|
|
|
CurrentEntry->ConfigurationData =
|
|
HwSetUpResourceDescriptor(Component,
|
|
LptPortName,
|
|
&ControlData,
|
|
0,
|
|
NULL
|
|
);
|
|
|
|
if (PreviousEntry) {
|
|
PreviousEntry->Sibling = CurrentEntry;
|
|
}
|
|
PreviousEntry = CurrentEntry;
|
|
}
|
|
}
|
|
return(FirstLptPort);
|
|
}
|